Sodium thiosulfate, also known as sodium hyposulfite, is a white crystalline compound that has a variety of industrial, scientific and medical applications. It is commonly used as a photographic fixer, a cleaning agent, and as an antidote for cyanide poisoning. Other synonyms for sodium thiosulfate include sodium thiosulphate, hypo, thio, thiosulphate, and sodium thio. These terms are often used interchangeably depending on the context. Sodium thiosulfate is an important chemical compound in many industries, and familiarity with its synonyms and common uses can be helpful in understanding its properties and applications.